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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e247f4634fb3d70e75a05f01fea51f4388654ac63746219f1ea6afa72c83c4c' 
  AND token = '9o9qnDnNQefjDakv1ACCiPDbwT2j7+QTh/jcLlCn9MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}